ملیسا، دختر نوجوان ۱۵ ،۱۶ ساله ای ست که کنجاوی و سرکشی دخترانه اش بر سادگی بیش از حد وی غالب می شود و در دام پسران جوان می افتد. دانیل ، معشوق وی، روزی می خواهد که در یک مهمانی برایش ساک بزند و کیرش را بخورد تا او تمام آب منی اش را در دهانش خالی کند و ملیسا که دختری نوجوان است می پذیرد، اما دانیل از عشق بیش از حد و سادگی بیش از اندازه او ، سوء استفاده می کند و روزی دیگر او را به خانه اش می آورد و از او می خواهد که پرده بکارت ش را پاره کند، ملیسا می پذیرد و او با یک ضرب پرده کس او را بر می دارد بعد از آن او را از نوجوانی عفیف ، به دختری فاسد و بدذات بدل می سازد
دوگانگی بین لذت و آسیب
لذتی که در روابط جنسی می برد مانع از این می شود تا از این روابط دست بکشد و سعی می کند در رابطه جنسی اختیار امور را خودش در دست بگیرد. اما این امر نیز منجر نمی شود تا از اضطراب شدید و آسیب های بعد از آن جلوگیری شود. وقتی که همکلاسی هایش دفترچه خاطرات او را پیدا می کنند و با صدای بلند می خوانند، همه آن ها را در دسته آدم های بد قرار می دهد. حتی بهترین دوست او مانوئلا نیز در این دسته قرار می گیرد و رابطه اش را با او قطع می کند.
این واکنش دوپاره سازی، نوعی مکانیزم دفاعی است که افراد در دو دسته خوب و بد قرار می گیرند و بین این دو قطب، چیزی وجود ندارد. افراد یا سفید هستند یا سیاه. پس از آن که در واکنش به این امر و به منظور انتقام، لباسی کوتاه می خرد و می پوشد. اوج غفلت مادر این جا مشخص می شود که با دیدن ظاهر دخترش، برعکس فکر می کند که اتفاق مثبتی در زندگی او افتاده است. روابط جنسی تا جایی پیش می رود که تبدیل به رابطه با چند و نفر و ورود خشونت های فیزیکی به رابطه می شود.
Melissa is a shy 15-year-old girl who lives with her mother Daria and her heavy-smoking grandmother Elvira, while her father is overseas working on an oil rig. She has a close relationship with her grandmother, but feels increasingly distant from her mother. On a summer afternoon, Melissa and her best friend Manuela attend a pool party at the home of Daniele, a wealthy, attractive boy from school, on whom Melissa has long had a crush. Daniele takes Melissa to a secluded spot, where they talk for a while before he has her perform oral sex on him. Despite the less-than-romantic encounter, Melissa’s feelings for Daniele only intensify.
After failed attempts to get Daniele’s attention, Melissa goes to a bar where he is hanging out with his friends. Daniele then takes Melissa to his place and she loses her virginity to him. She tells him she loves him, but he coldly rejects her. Humiliated, Melissa vows to never let anyone hurt her again and to only think of her own pleasure.
Melissa’s parents decide it is best to send Elvira off to a nursing home due to her heart condition, which further drives a wedge between Melissa and her mother. When Elvira comes home for Christmas, she senses that Melissa is going through a difficult time and tries to alert Daria, who is completely unaware.
One day, Melissa gets a phone call from Daniele, who says he has a surprise and asks her to come over to his place. There, Daniele and his friend Arnaldo goad her into a threesome. Though initially reluctant, Melissa decides to take control of the situation and explore her sexuality. At school, Melissa’s diary—in which she details her sexual encounters—falls into the hands of a classmate, who mockingly reads it out loud to other students, including Manuela. Melissa blames Manuela for it and the two have a falling-out.
Melissa gets a call from Arnaldo asking her to meet him. He takes her to an underground basement, where he blindfolds her and has her perform oral sex on him and four other young men. When Daria comes home, she is worried to find that Melissa is not home. She goes into Melissa’s room and finds her diary, shocked at its contents. While unsuccessfully trying to call Melissa, Daria goes to the nursing home to see Elvira, but is soon notified of her death.
Meanwhile, Melissa goes to the apartment of an older man she met on a chat room, who takes pleasure in being whipped. However, he soon becomes violent as he starts whipping Melissa, scaring her. She manages to flee and rushes over to the nursing home. When confronted by her mother about her diary, Melissa confirms that the things she wrote in it are true. The two share a tearful embrace, as Daria apologises for being so oblivious.
On the last day of school, Melissa and Manuela rekindle their friendship. Arnaldo confronts Daniele about having sex with his girlfriend, before slapping him in the face. A shy, eccentric student named Marco, who has long had a crush on Melissa, finally finds the courage to approach her. He says he will be transferring to an art school, showing her a notebook with sketches he has made of her. He draws one last sketch of her before they kiss each other on the cheek. After Marco leaves, Daniele shows up and invites Melissa to a party at his place that night; she reluctantly agrees. At the party, Melissa jumps off a cliff into the sea as Manuela, Daniele and other partygoers look on in awe. She then emerges to the surface with a smile on her face. Melissa and her mother bring flowers to Elvira’s grave, and the two joyfully hug each other.